A developable and recoverable self-expandable ureteral stent and its preparation method

Abstract

The invention relates to a developable and recyclable self-expanding ureteral stent tube and a preparation method thereof. A yarn is crocheted to make a ureteral stent tube. The rest of the thread is the recovery tail. When viewed from above, the uppermost layer of the stent tube is composed of a series of "V"-shaped yarn structures to form a coil, and the recycled tails are sequentially placed in the "V"-shaped yarn structure to form a ring shape. Specifically: pass the recovered tail from one side of a "V"-shaped yarn structure, and then pass through the other side of the next "V"-shaped yarn structure, and repeat the operation until the remaining thread is passed through the ureteral stent. The uppermost coil is locked; one end of the prepared ureteral stent is a temporary fixed structure formed by the recovery tail. When removing the ureteral stent of the present invention, the entire stent can be directly disassembled into one line and pulled out, avoiding secondary damage to the patient caused by removal, and has self-expandability and good visualization.

Description

technical field [0001] The invention belongs to the technical field of biomedical devices, and relates to a developable and recoverable self-expandable ureteral stent tube and a preparation method thereof. Background technique [0002] The ureteral stent is a specially designed hollow tubular stent placed on the lumen of the patient's ureter. It is one of the commonly used instruments in urology. Obstruction and stenosis. Ureteral stent design focuses on raw materials, surface characteristics, and shape design. An ideal ureteral stent should have the following characteristics: (1) It has certain compression and tensile properties, and can resist the pressure and peristalsis of the ureter. Keep the ureter unobstructed; (2) It has good biological compatibility, soft texture, smooth surface, is not easy to deposit stones and is antibacterial; (3) It can be absorbed by itself or taken out in a painless form, without causing secondary harm to the patient. Therefore, developing ...

AI Technical Summary

Problems solved by technology

The effect of magnetism can make the overall shrinkage of the stent during recovery, and the diameter becomes smaller. However, this kind of stent is special and requires a matching recovery device, which is difficult to be widely used, and the possible adhesion between the stent and the tissue is not considered. If the adhesion is serious , the magnetic force may be insufficient and the pulling force against adhesion

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